问kivy文本输入中的多个文本字段

EN

from kivy.app import App
from kivy.factory import Factory
from kivy.lang import Builder

kv = '''
<-TextInputNoBorder@TextInput>:
    # eliminates the TextInput border
    canvas.before:
        Color:
            rgba: self.background_color
        Rectangle:
            pos: self.pos
            size: self.size
        Color:
            rgba:
                (self.cursor_color
                if self.focus and not self._cursor_blink
                else (0, 0, 0, 0))
        Rectangle:
            pos: self._cursor_visual_pos
            size: root.cursor_width, -self._cursor_visual_height
        Color:
            rgba: self.disabled_foreground_color if self.disabled else (self.hint_text_color if not self.text else self.foreground_color)

<MyTextInput@BoxLayout>:
    # combine three TextInput Widgets to appear as one
    orientation: 'vertical'
    TextInputNoBorder:
        id: ti1
        text: 'This is One'
    TextInputNoBorder:
        id: ti2
        text: 'This is Two'
    TextInputNoBorder:
        id: ti3
        text: 'This is Three'
'''

class TestApp(App):
    def build(self):
        Builder.load_string(kv)
        return Factory.MyTextInput()

TestApp().run()